End dating of Units Of measure in iProcurement

Hi,

We are doing a clean up of units of measure.

In the iprocurement we wish to show only few units of measure.

Which other modules use unit of measure apart from iProcurement and Purchasing ?

If a purchase order uses a specific unit of measure and we end date it, what will be the impact on inflight documents.

Is there a way to hide certain unit of measure in iProcurement apart from end dating them.

Thanks in advance,

Emma